Cloth animation export Unity Stutter
Leave 'Rig / Animation Type' on 'Generic'
Switch to 'Animations', deactivate both 'Resample Curves' and 'Anim. Compression'-checkboxes
Switch back to 'Rig / Animation Type', select 'Legacy'
Click 'Apply'
Check the Animation-Preview - no stuttering!
Drag the FBX onto the scene-view-window
IMPORTANT: click 'Revert' rather than 'Apply' when asked whether unapplied import settings should be applied


Downsides:


No 'loop / ping-pong' etc. functionalities (I'll try to create a script-based-solution as a workaround)